Grinder for harrow-disks.



PATBNTED APR. 12, 1904.

F P. BURKHARDT. GRINDER FOR HARROW DISKS.

APPLICATION FILED SEPT. 8, 1902.

N0 MODEL.

mm mm".

5 E 5 E E vnz mums warms up, PNDY UNTTED STATES Patented April 12, 1904.

PATENT OFFICE.

FRANKLIN P. BURKHARDT, or CHICAGO, ILLINOIS, ASSIGNOR TO THE WARDER,BUSHNELL & GLESSNER COMPANY, or CHICAGO, ILLINOIS, v

A CORPORATION OF OHIO.

GRINDER FOR HARROW-DISKS.

SPECIFICATION forming part of Letters Patent No. 7 56,827, dated April12, 1904.

Application filed. September 8, 1902. Serial No. 122,484. (No model.) i

To all whom it may concern:

Be it known that I, FRANKLINP. BURKHARDT, a citizen of the UnitedStates, residing at Ohicago, in the county of Cook and State ofIllinois, have invented a new and useful lmprovement in Grinders forHarrow-Disks, of which the following is a specification.

This invention relates to grinders for harrow-disks.

The object of the invention is to simplify and improve the constructionof grinders for the disks employed in disk harrows and to render thesame eflicient in operation.

A further object of the invention is to provide a yielding pressure forthe disk operating to yieldingly press the same toward the grinder,whereby by relieving the pressure on the disk during the grindingoperation the speed of rotation of the disk while being ground may beregulated.

The invention consists substantially in the construction, combination,location, and arrangement of parts, all as will be more fullyhereinafter set forth, shown in the accompanying drawings, and finallypointed out in the appended claims.

Referring to the accompanying drawings and to the various views andreference-signs appearing thereon, Figure 1 is a view in side elevationof a grinder for harrow-disks embodying the principles of my invention.Fig. 2 is a section on the line 2 2, Fig. 1. is a detail view in sectionon the line 3 3 of Fig. 2 looking in the direction of the arrows.

The same part is designated by the same reference-sign wherever itoccurs throughout the several views.

Difiiculty has been experienced in sharpening the circular disksemployed in disk harrows. Machines have been devised for grinding thesedisks wherein the disks have been Fig. 3'

grinder a high speed of rotation, and which is objectionable.

It is among the special purposes of my insult I accomplish in a mostsimple and efficient manner in the constructlon shown and now to bedescribed.

Reference-sign A designates the grindingtool, which may be of anysuitable shape or form and supported in any convenient manneras, forinstance, in a framework B-and i driven or rotated through any suitableor convenient arrangement of gearing (indicated at O) or otherwise, as,may be found suitable or desirable.

D designates the harrow -disks suitably mounted for free axialrotationas, for instance, in the particular form shown (but to' whichthe invention is notlimited)by mounting the same centrally upon a studE, carried by a clip or block F, adjustably mounted upon an arm or barGr, suitably secured to or forming part of the framework B. Any suitablearrangement of tension device arranged to impose a yielding tension uponthe harrow-disk D tending to press the same yieldingly toward thegrinder may be employed within the spirit and scope of my invention. 1have shown a simple construction and arrangement which I have foundeffective and satisfactory, but to which I do not desire to be limited,wherein an arm H is pivotally mounted upon a convenient part of theframework or on arm Or and in position to engage the harrow-disk, so asto press the same yieldingly toward or in contact with the grinding-toolA. A spring J may be arranged to exert its tension upon pivoted arm H,so as to secure the desired degree of pressure of said arm against theharrow-disk.

From the foregoing description it will be readily seen that the operatorby placing one hand upon the face or side of the harrow-disk opposite tothat which is engaged by the lever H may vary, regulate, and control thepressure of the harrow-disk toward the grindingtool. With the other handthe operator imparts the rotations to the grinding-tool, andconsequently in this manner the speed of axial rotation of thebarrow-disk under the engagement therewith of the grinder may beregulated and controlled, so as to secure the desired grinding effect.It will be readily seen that if the same peripheral speed of rotation ofthe barrow-disk is attained as that of the grinding-tool the effect issubstantially the same as two friction-gears upon each otherthat is,therewould be no efficient grinding effect.

By the arrangement above described and forming the subject of myinvention by varying the yielding pressure tending to hold the diskpressed toward the grinding-tool I am enabled to control the relativeperipheral speeds of the disk and grinder, and hence securle the desiredefiicient grinding action of the too Any suitable or convenient meansmay be employed for clamping the framework upon the work-bench or otherconvenient place, and

- as the same forms no part of my present invention specific descriptionof such construct1on 1s unnecessary herein.

Having now set forth the ob ect and nature of my invention and aconstruction embodying against the grinder-tool, as and for the purposeset forth.

2. In an apparatus for grinding harrowdisks, the combination with agrinder-frame having an arm, a grinding-tool journaled in said frame,and means for rotating said tool, of a stud adjustably mounted upon saidarm and forming a support upon which the disk to be ground is supportedfor free rotation, and an arm yieldingly mounted upon said frame andarranged to bear against the disk to be ground, whereby said disk isyieldingly pressed into engagement with the grindertool, as and'for thepurpose set forth.

3. In an apparatus for grinding harrowdisks, a grinding-tool, and meansfor operating the same, in combination with a fixed stud upon which thedisk to be ground is loosely mounted to revolve, and means arranged tobear against the disk for yieldingly pressing the disk toward thegrinding-tool, as and for the purpose set forth.

4. In an apparatus for grinding harrowdisks, a grinding-tool, and meansfor operating the same, in combination with means for rotativelysupporting the disk to be ground, and means for yieldingly engaging theside or face of the disk to yieldingly press the opposite side or faceof said disk toward the grindingtool, as and for the purpose set forth.

5. In an apparatus of the class described, a frame, a stud mountedthereon and upon which the disk to be ground is mounted to rotate, an

arm mounted on said frame, and means for pressing said arm yieldinglyagainst the face or side of the disk, and a grinding-tool against whichthe opposite side or face of the disk bears, and means for rotating saidgrindingtool, all combined and arranged as and for the purpose setforth.

In Witness whereof I have hereunto set my hand, this 4th day ofSeptember, 1902, in the presence of the subscribing witnesses.

FRANKLIN P. BURKHABDT.

Witnesses:

L. O. PETERSON, A. L. SPRINKLE..

